Finding the Third Proportional to 646,665 and 978,943

Step by Step Solution

1. Step 1: Write the proportion equation
   646,665 : 978,943 = 978,943 : x
2. Step 2: Convert to fraction form
   646,665/978,943 = 978,943/x
3. Step 3: Cross multiply
   646,665x = 978,943 × 978,943
4. Step 4: Simplify right side
   646,665x = 958,329,397,249
5. Step 5: Solve for x
   x = 958,329,397,249/646,665
6. Step 6: Final answer
   x = 1,481,956.50